Die for bending angle bars



NOV. 17, 1931. HQSSFELD 1,832,210

DIE FOR BENDING ANGLE B ARS Filed Jan. 13, 1930 IN VE/Y 70/7. fiLEf/fi' fi my/5&0.

Patented Nov. 17, 1931 ALBERT nossnnnn, on W nona, iyrznnnso'ra DIE non BENDI-NG- ANGLE Bans Appli catioirfiled January 1a, 1930., seriainaaaas a This invention relates to a bending machine and particularly to a bending machine adapted to bend angle members or the ordlnary angle bars. Heretofore great difficulty 1 has been experienced in bending angle bars while cold. When an angle bar is bent about an axis perpendicular to one flange of the bar and at one side of said flange with the edge of said flange on the concave side of the bend, the metal in the flange is upset or increased in'thickness. The flange must beheld between surfaces on the die and if it is bent while between the surfaces the upset of the bar causes it to grip the surfaces so that great difliculty is experienced in releasing the bar. The neutral line of the bend in relation to the flange extends along alongitudinal line substantiallv at the midpoint of the flange transverselv thereof. While the metal at the edge of said flange is upset the metal at the opposite edge of. the flange adjacent the other flange is stretchedand the bar tends to twist about a longitudinal axis. tendency for the bar to bend about an axis extending transversely thereof. The bending of an angle bar and maintaining it'sproper shape has therefore been a very dlfiicult problem.

i It is an object of this invention therefore to provide a bending machine and d e "111. which an angle bar can be easilvand quickly bent and the propershape thereof maintained. 7

It is a further object, of the invention to provide a bending machine in which an angle bar can be quickly bent with the concave side ofthe bend extending along one edge'of the:

flange of the bar and about an axis perpendicular to said flanaeand said bar quicklyre leased aft-er it is bent; q 7

It is more specifically an object ofthejinvention to provide a die for bending an angle bar comprising a stationary member amovab e member, said members having substantially parallel surfaces between which one;

flange of the bar is: engaged. said members being movable toward, and from each other to rip and release said flange.

These and other objectsand advantages of i the invention will be fully set forth in the There is also a following description made. in;connection v with the accompanying drawings, in which like reference characters refer to similar parts throughout the several views, and in which I 1 Fig; 1 is a plan view of the device,.certain parts being broken away'and others shown in horizontal section and'some partsshown in different positions in dotted lines;

Fig. 2'is a view in sideelevation of the ma chineshown in Fig. 1; I

Fig. 8 is atop plan view of the bending. die; i

Fig. etis a view in front elevation of the bending die; I I

Fig. 5 ,is a vertical section taken ,on line 5-5 of Fig. 3 as indicatedbythe arrows;

Fig. 6 is a view" in end elevation ofthe bending die, and K i Fig. 7 is a partial viewin side elevation showing, the bending roller, a portion there of being in section. 4

Referring. to the drawings, a bending machine is shown having a stationary bending, arm 10. andwhile this arm may be varlously thiinbles 11; and connected by headed and nutted bolts 12. [The, other ends of bars 1005 .are paralleland spaced agr'eater distance;

said bars thus having intermediate divergent 7 portions. Aj spacing ,thimble 13 is disposed between the. outer ends of bars 10a. a headed V and, nutted bo t l llextending therethrough and through, the bars and also through the-5 centralportion of a small bracket 15 having 7 itsv end portion secured to awork table or bench 16 bv-headed and nutted bolts 17; An- V 7 other bracket 18 is disposed adjacent the approximate end of the bars and one of the boltsv 12, extends through the centralp'ortion there-' of. bracket 18 also being secured at its ends to bench 1.6 bvheaded and nutted bolts19. The bars have their outer ends rounded andare provided with a plurality 'of spaced holes 1072', verticallv aligned in the respective bars as showin The machine also has a'.

- spaced so that they substantially fit between the outer ends of bars 10a. The outer ends of bars 20a are closer together and are connected by spaced headed and nutted bolts 21 which also pass through a flat open-ended sleeve 22. A bar 23 is inserted in the outer end of sleeve 22 and is of considerable length a part-of said bar being shown as broken away in Fig. 1. A block 24- substantially square in cross section is disposed between the outer ends of bars 10a and held therebe tween by a headed pin 25 extending through a hole in the block anda pair of the holes 106.

' The hole in block 24 is eccentric to the center of said block. A bending roller 26 is disnosed between the bars 20/; and held therein -by a headed and nutted bolt 27 extending centrallv through said roller and a pair of holes 207;,said bars 200 being provided with a plurality of the holes 20. extending therethrough and vertically aligned in the re-- snective bars as shown; The inner ends of bars 20a are also rou'ndedv A die is provided for bending angle bars, t e same comprising'a stationarv member 28. Member 28 has a surface 280 which n the embodiment of the invention illustrated is shown as a substa t allv horizon al surface. Surface 28a is sub t ntially flat but mav desirab y be provided with a slight convex curvature. The outer or front surface 287) of memb r 28 isshown as curved on a radius the same as the radius of the desired bend. M mber 28 is shown'as havin an unner portion 280 and 'while this portion might be separate from memb r 28. in t e embod ment of the-invention illustrat d it is shown a 'being'integral with said member. Portion 286 has a do nwardlv incl ned surface 28d and while this might be of various angles, in the embodiment of he invention illustrated it is shown as disposed at anansrle of 45 degrees to the horizontal. Portion 280 also has a front surface 28 curved th sam and ve ically aligned with surface 287). Member 28 has a hole 287 ext-ending verticallv therethrough midway between the ends thereof and some distance from its front surface ada ted to have a h aded'pivoted pin 29 passed therethrough wh ch pin also passes through the" ends of bars 10a and 20a and connects the same for relative swinging movement. Member 28 tions ea ch of which as shown has extending V vertical v therethrough a hole28h. A rod 30 set screws 32 which collars engage the lugs 28g. The other end of rod 30 is adapted to v also has lugs 28; pro ecting re'arwardly at its end norsubstantially engage the top of the flange 33a of the angle bar 33 which is to be bent. Member 28 has a central groove 282' in the surface 28d thereof. A movable member .34 is provided which member has a surface 3 iaparallel to and substantially engaging the surface 28d of member 28. It will be understood that, as shown in Figs. 3 and 6, surfaces 28d and 34a are curved at substantially the same radius as surfaces 285 and 286. Movable member 3% also has a front surface 34?) curved on the same radius as surface 28?) which surface as stated has a curvature substantially equal to the curvature of the desired bend. Member 34; has bottom surface 340 which is substantially flat; but may desirably be slightly-concave and parallel to surface 284:. A lug 34d which projects from surface 34a is disposed in and adapted to slide in groove 282'. Tensile coiled springs 35 are disposed at either end of members 28 and 34 the ends of which members are substantially "flush and said springsare fastened at theirupper ends respectively to screws 36 in member 28 and screws 37 in member 3a.

' Iii-operation the swinging or bending arm 20 will be moved substantially tothe position shown in dotted lines in Fig. 1. The block 24L and roller 26 will be disposed as shown and the angle bar 33 will be inserted between block 2-32 and the member 34. -One flange shown as a horizontal flange will extend under member 3 in contact with surface 340 and the vertical flange will engage surface 3 1). The operator then swings bar 23 and presses roller 26 against the angle member 33. The pressure of the vertical flange 33b of said angle member against the front of movable member 34 causes said member to move inwardly and downwardly owing to the inclined surfaces 28d and 3-la and surface 340 moves down wardly so that the horizontal flange 33a is gripped between surfaces 340 and 28a. The rod 30 is swung so that'its free end is over the flange 33a. The operator now by swinging bar 23 bends the angle about the front sur Fig. 1. As soon as pressure is released from the bending arm 20 and roller 26 and angle 33 is moved slightlv outwardly, member 34 is pulled upwardly bv springs 35 to the position shown in Fig. 6. The operator can now push the angle bar 33further along if it is desired to bend the same further. The angle bar 33 can thus. be successively bent about the die comprising members 28 and 34 until the desired bend a been secured. The pressure against the front of member 3 holds the flange 33a in position and prevents any twisting or buckling thereof due to the fact that the flange is engaged betwen surfaces 340 and 28a. The angle is kent from lifting at its outer end by rod 30. The lung 34d moving in slot 282' acts as a. guide in the movement of member 34 and resists any tendency for endwise movement. The stoving up orthickenmg ofthe edge of flange. 3305 gives the angle bar a tendency to bend'upwardly. I. The surfaces 28a and 340* are given a-slightdownward. curve to counteract this tendency which applicant has provided a simple and very eflicient structure of die for bending. angle bars, particularly when the bar is to be .bent

about an axis perpendicular to one flange with the edge of said flange on theinside or concave side of the bend. The bar is effectively held in place while the bending pressure is applied and any warping or twisting of the bar is prevented. The angle bar can be very. quickly bent and: asstated, can be moved endwise after each successive bend to give as great a curvature. as desired. Different dies, of course, will. be usedfor different curvatures. The device has been amply demonstrated 7 in actual practice and found to be very successful. and eflicient.

It will, of course, be understood thativarious changes may be. made in. the form, details, proportions and arrangement of: the parts without departing from the. scope of applicants invention, which, generally stated, consists in adevicecapable: of? carrying out the objects above set forth, in the novel parts and combinations of parts disclosed and definedin the appended claims;

\Vhat is claimed is Y 1. A bending machine having a die for bending an angle bar comprising two relatively movable members with substantially parallel surfa ces adapted to engage a flange of said angle bar therebetween, resilient means holding one of said members in position with said surfaces separated. said members being relatively moved in the bending operation to cause said parallel surfaces to engage said flange against the action'of said resilient means.

2. A bending machine having'a die about which angle iron is to be bentcomprising. a stationary member with a surface with which one flange of the angleiron engages, a movable member having a surface with the desired curvature of the bend and having a surface extending substantially at right anglesto said curved surface substantially parallel to saidsurface on said stationary member, said movable member being movable toward the stationary member and engaging the opposite side of the flange engaging said first mentioned surface and movable away from saidstationary member after the angle iron is bent.

3. The structure set forth in claim 1 and a member engaging thetop of the flange rest,-

ing on said stationary member at some distance from said die to prevent upward move ment of the" angle member. 7

4a. The structure set forth in claim 2 and. a swinging member having a portion dis posed at some distance from said dieand resting on top of the flange of the angle member disposed between said parallel surfaces to prevent upward movement of said angle member. 1

5. A bending machine having a die about which angle iron is 'tobe bent comprising a stationaryv member having a surface with.

which one flange of the angle iron engages, movable member having a curved surface and having a surface extending substantial.- lyat rightv angles to said curved surface substantially' parallel to said surface on'said stationary member, resilient means holding said movable member in position with said parallel surfaces separated and means for guiding said movablemember'toward said stationary member to cause said parallel surfaces to move nearer together, said movable member being'caused to move toward said stationary member by the pressure of the angle iron against said curved surface, one flange of said angle iron being engagedbetween said parallel surfaces, said movable member being retracted to normal position by said resilient means after the angleriron is bent.

6. A bendingtmachine' having a die about which angle. ironis tobe bent comprising a stationary member with a'substantially fiat surface and having a-surface: inclined at an angle to sa dvflat surface, a movable member having an inclined surface engaging said lat I ter surface and movable therealong, said movable die having a substantiallvflat surface extending parallel to said first mentionedsu-rface-and having a surface with a curvature ofthe desired bend, means holding said movable member in position with said para-llelsurfaces spaced, said movable member being movable by the pressure of the'angle iron against i-t'securved surface to bring'said parallel. surfaces into engagement with oppositesidesof one flange of the angle IEOII'.

V 7. A bending machine-having a die about which an anglebar is to be bent comprising a stationary member having a substantiallyflatsurface with which one flange of. the

angle bar engages, said-inember having a movable and stationary members whereby when bending; pressure of. the angle 1IYOI1'1 brought. against said, curved surface? of thefv connected at their ends respectively to said 7 member having-a surface with which one flange of the angle bar to be bent engages,

ainovable member having a surface substantially parallel to said surface, means for guiding said movable member to cause said last mentioned surface to approach said first mentioned surface, said movable member having. an outer surface with a curvature substantially equal to the curvature of the desired bend, a block on said stationary arm.

. adjacent one end of said die, a roller carried on said swinging arm adjacent the other end of said die whereby. pressure can be exerted on an angle bar, the flange of said bar engaging said outer surface of the movable member and moving it to bring said parallel surfaces into enqaszement with the first mentioned flange ofsaid ane'le' bar.

' 9. A bending machine hav ng a die for bend ngan angle bar comprising relativelv movable members ad anted to engage a flan e of said angle bar therebetween, one of said members being moved by the other flame of said angle bar in the bending operationto cause the membe s to engage said first mentioned flange un er pressure.

10. A bend-inn machine bav ne: a die abo t wh ch an ang e bar is to be bent, comprisin a stationa v member bavin a sur ace w th which a face of a flan e of 'tbe anq e bar engages. a m vable member hevine: a

bend ng surface and a surface ertending in an ular re ation tosaid bendin surfa e and substantially parallel'to sa d surface of said stationar member. said movable member eng movab e oward t e station rv member to cause said angularly extending'surface to envaefe the onnosite face of sa flan 'e engaging said first mentioned surface. and

adapted to be mo ed nwav from said stat nnarv member after he anode b r is bent,

ll. A bend ma h ne hav n a die about which an angle bar is to be bent. com risinflt a ta onar member. a member mo 6 Te fiVG V lIQTPtO and having a bendn s1 rfee and means for ono arrinw n Harm-e of sa d angle ar to bend it about sa d bendin s rface.- said m ns b n operat e u on said movab e mem 'eridur n the b nding o era on to move it w rd said st nnarv m m er to grip the; other flann'e of said an e b r between sa d stat onarv and movable members and sa d 'statonarv and movab e member be nmada'nted to releasethe r'o'rin unon sa d otherflange attbeevnirar of the bendingoperation'upon" said angle bar;

- 12. A device for bending angle bars having in combination, a die member having a substantially flat surface and having a surface inclined at an angle to said fiat surface, a second die member having a fiat surface substantially parallel to said flat surface, a curved surface engageable by said angle bar, and a surface inclined to its flat surface disposed to engage the first mentioned inclined surface, said angle ironengaging the curved surface of said second member in the bending operation, said members being relatively moved by said inclined surface to cause said flat surfaces to approach andgrip one flange of said angle bar.

13'. A device for bending angle irons havingin combination, a pair of relatively movable die members having thereon respective ly flat surfaces between which one flange of said angle barls disnosed,one of said dies having a. curved surface engageable by said angle bar, and wedge means causing movement of saiddies to cause said flat surfaces to grip one flange of said bar therebetween.

let. A. machine for bending angle irons having in combination 'a die member with a substantially flat surface, a second die member having va flat surface disposed substantially parallel to said flat surface and having a curved surface engaged by said angle bar in the bending operation, means for moving said angle bar-against said curved sur face, and means carried by said dies for causing relative movement thereof when said angle bar is pressed againstsaid curved surfaces to cause'said other surfaces tog-rip one flange of said angle bar.

In testimony whereof I affix my signature.

ALBERT HOSSFELD.

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